netdev - Re: [PATCH v4 2/3] net: qrtr: support suspend/hibernation

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Message-ID: <ea483a49-9880-4631-a008-a437dec2b133@quicinc.com>
Date: Wed, 28 Feb 2024 07:12:13 -0800
From: Jeff Johnson <quic_jjohnson@...cinc.com>
To: Baochen Qiang <quic_bqiang@...cinc.com>, <ath11k@...ts.infradead.org>,
        <manivannan.sadhasivam@...aro.org>
CC: <linux-wireless@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <mhi@...ts.linux.dev>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] net: qrtr: support suspend/hibernation

On 2/27/2024 6:22 PM, Baochen Qiang wrote:
> MHI devices may not be destroyed during suspend/hibernation, so need
> to unprepare/prepare MHI channels throughout the transition, this is
> done by adding suspend/resume callbacks.
> 
> The suspend callback is called in the late suspend stage, this means
> MHI channels are still alive at suspend stage, and that makes it
> possible for an MHI controller driver to communicate with others over
> those channels at suspend stage. While the resume callback is called
> in the early resume stage, for a similar reason.
> 
> Also note that we won't do unprepare/prepare when MHI device is in
> suspend state because it's pointless if MHI is only meant to go through
> a suspend/resume transition, instead of a complete power cycle.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
> 
> Signed-off-by: Baochen Qiang <quic_bqiang@...cinc.com>
Reviewed-by: Jeff Johnson <quic_jjohnson@...cinc.com>